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. 1992 Mar;98(3):1148–1153. doi: 10.1104/pp.98.3.1148

Diacylglycerol Kinase from Suspension Cultured Plant Cells 1

Characterization and Subcellular Localization

Josef B Wissing 1, Karl G Wagner 1
PMCID: PMC1080320  PMID: 16668739

Abstract

Diacylglycerol kinase (adenosine 5′-triphosphate:1,2-diacylglycerol 3-phosphotransferase, EC 2.7.1.107), purified from suspension cultured Catharanthus roseus cells (J Wissing, S Heim, KG Wagner [1989] Plant Physiol 90: 1546-1551), was further characterized and its subcellular location was investigated. The enzyme revealed a complex dependency on lipids and surfactants; its activity was stimulated by certain phospholipids, with phosphatidylinositol and phosphatidylglycerol as the most effective species, and by deoxycholate. In the presence of Triton X-100, used for its purification, a biphasic dependency upon diacylglycerol was observed and the apparent Michaelis constant values for diacylglycerol decreased with decreasing Triton concentration. The enzyme accepted both adenosine 5′-triphosphate and guanosine 5′-triphosphate as substrate and showed rather low apparent inhibition constant values for all nucleoside diphosphates tested. Diacylglycerol kinase is an intrinsic membrane protein and no activity was found in the cytosol. An investigation of different cellular membrane fractions confirmed its location in the plasma membrane.

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Selected References

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